The Good Son - S1-E1
Continuity mistake: In the scene where Daphne first comes to the apartment, the beer can and remote control on Martin's side table change positions between shots.
Continuity mistake: When Frasier and Niles are eating the steaks at the restaurant that Martin brought them to, in some shots you can see Frasier's baked potato, and in others from the same angle it is not visible.
Continuity mistake: When Frasier asks Martin "Where are your pants?", Marty is holding the ice cream carton underneath, but when the shot changes and he answers, "In the fridge", he is holding the carton by the side.
Continuity mistake: When Frasier and Martin are yelling at each other about the mess on the carpet, Marty is holding a red plastic oil container. In one shot there is a noticeable dribble of oil on it, but in the shots before and after, it is clean.
You Can't Tell a Crook by His Cover - S1-E15
Continuity mistake: When Frasier and Martin are looking at Frank examining the bowl, the cards on the table change position.
A Midwinter Night's Dream - S1-E17
Continuity mistake: When Martin is giving Niles ideas on how to win Maris back, the food on Martin's fork changes between shots.
The Good Son - S1-E1
Continuity mistake: At the beginning of the show, when Roz is telling Frasier the mistakes he's made, the clock shows 4:52. However, after she says "you kept referring to Jerry.as Jeff", the clock is reading 4:50.
Continuity mistake: While Martin is saying grace, Eddie is sitting right on his backside staring at Frasier, who yells "will you stop staring!" The next shot, from behind Eddie, shows him noticeably leaning over on one haunch, even though there was no time for the change.
A Midwinter Night's Dream - S1-E17
Plot hole: Niles makes up Frasier's couch to sleep in and when he lies down he lets out a yelp - and pulls a plastic pirate's hook from behind the cushions. Earlier Niles had appeared wearing a pirate's costume but at no point did he have a hook, nor did he go near the couch. His overcoat had been on the floor the whole time so it couldn't have come from there. It would have been difficult for it to get behind the cushions unless deliberately shoved there, which we never saw and makes no sense anyway.
Radio Wars - S7-E3
Continuity mistake: When Marty comes into the living room and says, "Man, they got you good", Frasier has his cup and saucer in his hand. When the shot changes, though, the cup and saucer are sitting on the table, a few inches away from his hand.
Continuity mistake: Niles comes into Cafe Nervosa and Marty has his hands down in this lap. Niles says "not interrupting anything personal, am I?" the shot goes back to Marty, whose arms are now folded.
The Good Son - S1-E1
Continuity mistake: When Martin lies back in the chair for the first time, it changes how slanted it is in the first two shots.
Continuity mistake: Before they begin supper, Marty asks the boys if they still say a prayer before eating. His hands are clasped together in front of him, but in the next shot they are folded over each other.
The Good Son - S1-E1
Continuity mistake: Near the end of the show, when Roz is telling Frasier about Lupe Velez, the wall clock in her booth shows the time to be 3:45. About 5 minutes pass, although the story only takes a couple of minutes, and there is no other action in the scene. The clock actually goes backward after that, showing 3:50 and then about 3:48 in the next shot.
Revealing mistake: The view from Frasier's apartment shows the Space Needle prominently in the background, however, the elevator that takes visitors from the ground to the observation deck is frozen in time midway to the top. This was corrected after the first season.
Continuity mistake: In the scene where Niles meets Daphne for the first time she is folding laundry and is holding a tee shirt that switches back and forth from being over her arm to being held in her fingers while they talk.
Continuity mistake: While Daphne is making psychic predictions about Marty's murder case, there is a pencil lying under some photos. In one shot the pencil has disappeared but it reappears again in later shots. The angle stayed the same.
A Midwinter Night's Dream - S1-E17
Continuity mistake: In the opening scene when Daphne and Eric are talking, the dish towel over Eric's shoulder is laid flat in some shots, and is twisted up in others.
Continuity mistake: Near the beginning of the show, Frasier brings Roz a muffin in a bag which she places to the left of her phone (her left). During the scene, the bag shifts from being near the console to being back to left of the phone. At one point Frasier and Roz leave the booth, then come back in, and it has moved in the meantime.
No Sex Please, We're Skittish - S11-E1
Continuity mistake: When Niles goes to the sperm bank, in one shot his hands are up on the counter with his fingers laced and in the next shot they are lying flat on the counter.
Answer: It equals the record of James Arness of "Gunsmoke" for the actor who's played the same part on TV NOT in a soap opera. If you include soaps there are two main contenders - William Roache, who's been playing Ken Barlow in "Coronation Street" in the UK since 1960. Don Hastings has been playing Robert Hughes in US soap "As the World Turns" since 1960 as well.